参数平均方式对层状夹砂土壤积水入渗数值模拟的影响
发布时间：2019-04-29 11:14
【摘要】：为研究非饱和土壤水分运动方程中参数的平均方式对层状土水分运动数值模拟的影响,采用有限差分方法对Richards方程进行离散,并用MATLAB软件编程模拟层状夹砂土柱的薄层积水入渗过程。对差分网格中半节点参数的8种不同平均方式进行了数值模拟稳定性和精度的比较。结果表明:不同平均方式下湿润峰到达某一深度的时间与该处的土壤含水量增速呈负相关关系;间接算术平均和调和平均下的土壤含水率数值振荡较大;几何平均和三点平均2种方式下入渗率、累积入渗量和湿润锋误差相对较小。综合分析,几何平均和三点平均更适合层状夹砂土情况下薄层积水入渗过程的数值模拟。
[Abstract]:In order to study the influence of the average method of parameters in unsaturated soil water movement equation on numerical simulation of layered soil water movement, the finite difference method was used to discretize the Richards equation. MATLAB software was used to simulate the thin-layer infiltration process of layered sand-entrained soil column. In this paper, the stability and accuracy of the numerical simulation are compared for eight different averages of the half-node parameters in the difference grid. The results show that there is a negative correlation between the time of wetting peak reaching a certain depth and the increase of soil moisture content under different average modes, and the numerical oscillation of soil moisture content under indirect arithmetic mean and harmonic average is larger. The infiltration rate, cumulative infiltration amount and wet front error are relatively small in geometric and three-point averages. Comprehensive analysis shows that geometric average and three-point average are more suitable for numerical simulation of thin-layer water infiltration process in layered sand-entrained soil.
【作者单位】： 中国农业大学水利与土木工程学院;
【基金】：国家自然基金项目(51379207) 国家自然科学基金创新群体项目(51321001)
【分类号】：S152.7
[Abstract]:In order to study the influence of the average method of parameters in unsaturated soil water movement equation on numerical simulation of layered soil water movement, the finite difference method was used to discretize the Richards equation. MATLAB software was used to simulate the thin-layer infiltration process of layered sand-entrained soil column. In this paper, the stability and accuracy of the numerical simulation are compared for eight different averages of the half-node parameters in the difference grid. The results show that there is a negative correlation between the time of wetting peak reaching a certain depth and the increase of soil moisture content under different average modes, and the numerical oscillation of soil moisture content under indirect arithmetic mean and harmonic average is larger. The infiltration rate, cumulative infiltration amount and wet front error are relatively small in geometric and three-point averages. Comprehensive analysis shows that geometric average and three-point average are more suitable for numerical simulation of thin-layer water infiltration process in layered sand-entrained soil.
【作者单位】： 中国农业大学水利与土木工程学院;
【基金】：国家自然基金项目(51379207) 国家自然科学基金创新群体项目(51321001)
【分类号】：S152.7
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